I’m getting the same error reported on a new GPU (5060Ti with 8GB VRAM) but no noticeable freezes. I raised an issue: OpenCL "could not allocate oversize buffer on device" · Issue #20050 · darktable-org/darktable · GitHub
This exact error message was changed in a very recent PR (Fix highlights opposed OpenCL by jenshannoschwalm · Pull Request #19788 · darktable-org/darktable · GitHub)